TinyGrab is a handy little site that lets users share their screen shots via a "web 2.0" format. What that means is a user logs in w/ an account, uploads their screen shots, and then can share it w/ others. TinyGrab makes this process very simple.
All a user has to do is use the Mac key command (shift+apple+4) to a screen grab and then upload via the TG interface. Keep in mind this is strictly a Mac App.
For more info click here.
Below is the tutorial straight from their site....